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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b37090945355e9b45ed10feb99baf3ce78c88ffc780e01e3d4174a064547b0f2' 
  AND token = 'MyMBmcdmGhrLaJJg6iMclG012f0mjzvquJqeF/FDHlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}